High tension insulator



P .1932- 2 "J. F. SCHYEID 1,877,630

HIGH TENSION INSULATOR Filed Oct. 18, 1924 Patented Sept 13, 1932 UNITEDSTATES PATENT orrlcr.

J'OHANN FRIEDRICH SCHEID, OI HEBMSDOBF, GERMANY, ASSIGIIOR '10HERMSDOBF- SCHOMB'URG-ISOLATOBEN G. M. B. 5., SITZ BERLIN, VEBWALTUNGHERMSDORF IN THURINGEN HIGH TENSION INSULATOR Application filed October18, 1924, Serial No. 744,824, and in Germany May 20, 1924.

My invention relates to high-tension insulators of the type in whichseveral cups or petticoats are superposed to form a unit adapted to beattached to the usual support- 5 ing pin or bracket.

' Double-cup or triple-cup insulators are known in which theinterconnection between the single cups and the connection with thesupporting bracket or pin is effected or ensured by way of cementing orbaking and the like. This mode of uniting the parts together, however,is objectionable for the reason that the cups are liable to internalstrains and tensions frequently resulting in premature destruction.

The object of my invention is to remedy this defect. With this object inview the present invention consists in the application of an elastic orresilient layer, preferably in the shape of a sleeve, intermediatebetween the single cups in order to give the assembled parts a firm andreliable but slightly yieldin g connection.

To this end the inner face of the outer cup or cups is shaped to form athread whilst the opposed outer face of the inner cup or cups, either isroughened only or likewise threaded in a manner that the two meetingthreads do not at all engage with each other or that they do engage witha certain play so as to afford a clearance for the reception of the saidresilient layer or sleeve. The roughening of the outer face of the cupsmay be brought about by coarse sanding or knurling' or by providing fineridges in the surface or in any other appropriate manner.

Prior to the assemblage of the parts a layer of fibrous material such ashemp or hemphards, oakum, papier-mach, cardboard, paper mass or fibresor the like is applied to the outer roughened or threaded face of theinner cup or'cups. Preferablythe said layer is soaked in a liquid ofpreservative nature in order to obviate putrefaction and decay and, atthe same time, of hardening properties in order to solidify with thesaid layer of fibrous material to form and constitute a yielding sleevebetween the opposing faces of the parts. Liquids that suit the purposebest may be thick solutions of certain agglutinants,

such as dextrine, preferably mixed with a small percentage of anysuitable preservative substance, such as carbolic acid, solutions ofresinous substances, varnishes, tar, linseed oil mixed with minium orwhite lead and the like. I

Having thus set forth in general the principles upon which my inventiondepends and having shown the particular improvements effected over theprior art, I shall now particularly describe two simple embodimentsthereof which I have shown diagrammatically in the accompanying drawingforming a part of this specification, for the purpose of more fullydisclosing mv invention, but it is to be understoodthat such diagramsillustrate only two of the numerous possible embodiments of my inventionwhich I have successfully used in practice and that I do not limitmyself thereto in as much as many modifications may be devised by thoseskilled in the art without departing from the spirit of my invention.

In the drawing Figure 1 illustrates a triple-cup or tripleetticoatinsulator adapted to be mounted on its supporting member, which may be asteel pin of conventional construction, the view being partly insection, partly in elevation, and Figure 2 is a similar view of adouble-cup or double-petticoat insulator.

The insulator shown in Figure 1 comprises three cups 1, 2 and 3 of anysuitable construction and assembled, as usually to form a unit.According to my invention the inner circumferential faces 2*, 3 of thetwo outer cups 2 and 3 are provided with a fine thread, whilst theopposed outer circumferential faces 1 and 2 of the cups 1 and 2 areprovided with circumferential grooves 4 and the sections thereofintermediate between two adjacent grooves are roughened e. g. coarselysanded, the inner and outer diametrical dimensions of the cups beingsuch that, when assembled, a clearance will exist between each twoopposed or cooperating surfaces of the cups for the entire area thereof.The clearance between the circumferential faces 1?, 2 and 2 3, however,is, in accordance with my invention, occupied by or filled withresilient din matter of the kind herebefore indicated, such as hemp orsimilar fibrous mass, paper stuff and the like which will ensure ahighly efiicient connection between the parts. This filler is applied tothe outer roughened and peripherally grooved circumferential surface ofthe inner cup and the outer cup is then mounted thereon by a rotarymovement causing the fine thread on the inner circumferential surface tobite into the material applied to the inner cup and effect an embeddingof the filler material into the peripheral grooves in the outercircumferential surface of the inner cup and embed the roughenedcircumferential surface of the inner cup in the filler material, notonly firmly uniting the cups and the cups to the support, but the fillermaterial also compensating for variations in the cups effected byexpansion'and contraction of the material of the cups due to atmosphericor other conditions.

In order to increase the firmness of the connection thus established thefilling matter may be soaked or treated with a suitable solidifying andpreservative liquid, as above stated, acting to unite the fibrousmaterial so as to form a solid but still yielding body in the shape of asleeve between each two opposed faces of the cups and the supportingmember, respectively. In some cases the supporting bracket or pin may bescrewed into the innermost cup as is usually done in insulators of usualconstruction.

In case that a fibrous mass of material such as hemp, oakum and the likeis employed for the filling purpose a binder of gelatin or viscoussubstance, such as varnish, a dextrine solution, a mixture of minium orwhite lead with boiled linseed oil and the like may be used for thepurpose'of previously treating by soaking or saturating and uniting withsaid gelatine or viscous substance the fibrous material, but if a paperstuffor cardboard is employed tar appears to be preferable for thepurpose. Generally speaking, it is advisable to use, for the treating orsoaking purpose, suitable substances or liquids of preservative natureor decay resisting properties in order to prevent the filler fromdecomposition and putrefaction.

In the embodiment shown in Figure 2 the cups and the supporting pin arescrew threaded and in order to assemble the same they must be screwedtogether. 'The threads,. however, differ in diametrical regards, so

that a clearance or gap will exist between each two opposed faces which,however, is not wide enough to allow of disengaging the parts from eachother in axial direction, it being rather necessary to turn the one orthe other in order to unscrew the same. In this modificationthere aretwo cups and 7 only and, as will be clearly seen in the drawing, thecoarse threads 8 of the cups and the pin 10, respectively, leave aclearance between their opposed faces which is equal in width to thedifference between the diameters of the outer thread of the one body andthe diameters of the female thread of the engaging other body.

The clearance or free space between the threaded portions of the cupsand the pin, respectively, is filled up with a fibrous material, such ashemp or oakum soaked and united with a solution of dextrine or ofsuitable resinous substances, linseed oil mixed with minium or the likeor the filler may consist of cardboard treated or soaked with tar or thelike. In the former case the soaked fibrous material is applied to thethreaded faces in the usual manner of fixing insulators with hemp to thebrackets or pins and the said material then soon solidifies to form afirm and yielding body or sleeve snugly fitting in the clearance or gapbetween the circumferential portions, the remaining portion of the gapbeing free and clear. In the latter case a small sheet of cardboard cutto conform in length and width to the threaded outer face of the cup 7or the pin 10, is laid over and onto the said outer face of the cup orpin so as to form a closed sleeve 9 thereabout. As above stated thecardboard is treated orsoaked with tar or the like and having beenapplied to the cup 7 or the pin 10 in the manner described, the cup 6 orthe cup 7, respectively, is screwed over and about the sleeve 9 whichowing to its flexibility, will adopt the threaded shape of the clearanceor gap so as to lie snugly embedded within the latter and in intimatetouch with the engaging faces of the cups vor the pin, respectively. Inlieu of employing a sheet of cardboard a previously preparedclosedsleeve of cardboard having the proper size to snugly fit to the threadedportion of the cup 7 or the pin 10, may be used. It goes without sayingthat the manner in which the parts are assembled and fixed with eachother is the same in regard to the pin 10 and the cup 7 or the cup 7 andthe outer cup 6. For electrostatic reasons the opposed or engaging facesof the cups and, if required, of the supporting pin maly be covered witha conducting coating. t will be evident that my invention, whilst stillbeing adhered to in its main essentials, may be varied and adapted inmany ways, as herein before stated already, according to theseveralrequirements desired, or most suitable under differentcircumstances.

What I claim is 1. In an electric high tension insulator,

thereby supported on the cup, and a second insulator cup 'surroundingsaid first-mentioned cup and having the inner circumferential facerecessed and bearing upon said sleeve, said sleeve forming the solemeans of securing said two cups.

2 In an electric high tension insulator, an insulator on having an outerrecessed circumferentia face, a sleeve of yielding material composed ofmassed fibers impreghated and united to each other by a varnishsurrounding the outer circumferential face of said cup and arran d incontact with said face and engaging t e circumferential recesses therebysupported on the cup and a second insulator on surrounding saidfirstmentioned cup and aving the inner circumferential face recessed andbearing upon said sleeve, said sleeve forming the sole means of securingsaid two cups.

3. An electric multi art insulator comprisin a plurality o insulatorcups arrange in nested relation and having opposed irregular facessecured to each other solely by an interposed elastic layer of massedfibers which are impregnated with and united to each other by varnish.

In witness whereof I have hereunto set my hand.

JOHANN FRIEDRICH SCHEID.

